Fluid-break switch



Dec. 25, 192.8.

J. D. HILLIARD FLUID BREAK SWITCH Orig inal Filed March so; 1922 v Ill/Ill!!! IIIIIIIIIIIIIIIIIIIIII nllllmlllllznrl In ven tor. John D. HLLLLard,

H'Ls- Atforngy within the switch is emp Patented Dec. 25, 1928.

JOHN D. EILLIARD, OF S COMPANY, A G

Original application filed March 30, 192

My invention relates t of the fluid break type an TES 1,696,604 PATENT OFFICE.

CHENECTADY, NEW YORK, ASSIGNOR TO GENERAL ELECTRIC ORPORATION OF NEW YORK.

FLUID-BREAK SWITCH.

2, Serial No. 548,155. Divided and this application filed July 1,

1925. Serial No. 40,937.

0 electric switches d an object of my invention is to provide an lmproved switch of this character wherein the greater acceleration in ment of the switch. invention is the provision 0 switch for decel after the arc is bro a division of my rial No. 548,155,

My from the following descri nection with the accompanying its scope willbe point claims.

The single figure of th filed March 30, invention will be better gas formed loyed for causing a the opening move- Another object of my f means in the crating the movable contact ken. This application is co-pending application, Se-

1922. understood ption taken in condrawing, and ed out in the appended e drawing illustrates a side elevation of a switch involving my invention, parts clearly illustra 1 Mounted upon insulator 2is the ed to contain a the level of which is indie line.

stationary contact contact 5 co-operates to control The stationary con nected with the con suitable insula At thebottom of the conta contact 5 is adapted to operate insulating bushing of the container.

with

6 supported a horizontal The container is partition 7 extending same into a lower The hollow cylin- 8 is carried centrally by the d within this member moves argement 9 on the contact 5.

being shown in section to more te the construction.

the base 1. by means of the container 3 which is adaptting liquid,

ated by the dotted iner 3 is the 4 with which the movable the circuit.

tact 4 is electrically container 3 but the movable through an at the top The purpose of this construction is to impart to the very high velocity u movable contact of the switch a nder the influence of the pressure created at the separation of the con-- The function of the disk 9 is tooflfer a large surface to the fluid under tacts.

"that the contact 5 wi greater force.

For decelerating the contact 5 vided a dash pot 1O submerged pressure so ll be moved with a I have proin the insu lating liquid in the casing 3. This dash pot as shown is insulator 6 and is adapt largement 9 after it ha tance mounted on the lowe between the member 8 an 1' end of the ed to receive the ens traversedthe disd the lower formed end of the dash pot. It is obvious that this dash pot may be embodied in a variety of forms. In the form illustrated I have shown 1t as a cup-shaped member having a central opening 11 which decreases somewhat in diameter from its lower end. I also have provided openings 12 through the walls of the cup-shaped member to provide a passage for the liquid as the enlargement 9 moves in the dash pot. It will be noted that by reason ofthe taper of the opening in the dash pot and by reason of the openings 12 in the walls thereof the resistance offered to the passage of the enlargement in the dash pot increases in proportion to the distance it has traversed from the lower end thereof.

While I have described only one embodiment of my invention, I do not wish to be limited to the particular form shown and described as it will be apparent that modifications therein may be made without departing from the scope of my invention as set forth in the appended claims.

IVhat I claim as new and desire to secure by Letters Patent of the United States, is,-

1. A switch comprising a casing adapted to contain insulating liquid, a fixed contact mounted at one end of the casing, a contact rod mountedto slide'in the opposite end of the casing and having an enlarged interme-- diate portion, and a partition in the casing having a cylindrical opening for receiving the enlarged portion of the contact rod.

2. A switch comprising a casing adapted to contain insulating liquid, a fixed contact at one end thereof, a contact rod movable through the opposite end thereof, said rod having a piston like enlargement and spaced cylindrical members in said casing arranged successively to receive said enlargement during the open circuit movement of the contact rod whereby pressure on one side of the enlargement produced at the initial separation of the contacts accelerates the opening movement of the switch and pressure on the opposite side of the enlargement subsequently decelerates said movement.

3. A switch comprising a casing adapted to contain an insulating liquid, a fixc 1 contact mounted at one end of the casing, a dash pot in the casing, a partition therein between the dash pot and the fixed contact having a central opening therein and a movable contact rod having an enlarged portion forming a piston adapted when the switch is opened to pass through said opening and subsequently enter said dash pot.

4. The combination with a receptacle adapted to contain a liquid, an insulator extending into said receptacle and formed with an opening therethrough, a dash pot supported by said insulator, a contact within said receptaele,a second contact adapted to extend through the opening in said insulator into contact with said first-mentioned contact and withdrawable from said firstmentioned contact to break the circuit, said second contact being formed with a surface arranged to be subject to the pressure within said liquid created by the are formed at the separationof said contacts whereby a high contact and withdrawable therefrom to break,

the circuit, said second contact being formed with a surface arranged to be subject to the subject to the ated by the are formed at the separation of eaaeoa pressure within said liquid created by the are formed at the separation of said contacts whereby a high velocity is imparted to said second contact, said second contact being also provided with means adapted to cooperate with said dash pot whereby said latter contact may be subsequently means within said receptacle for causing the liquid to be forced into the path of the arc during the separation of said contacts.

6. The combination with a receptacle adapted to contain a liquid, an insulator extending into said receptacle and formed with an opening therethrough, a dash pot su ported by said insulator, a contact within said receptacle adapted to extend through the opening in said insulator into contact with said first-mentioned contact and separable from said first-mentioned contact to break the circuit, said latter contact being formed with a piston so arranged as tobe pressure within the liquid crethe contacts, and means within said receptacle for causing the said pressure to be exerted upon one side only of said piston whereby said latter contact is forced away from said first-mentioned contact by the said pressure, said piston being arranged to cooperate with said dash pot subsequently to decelerate said contact.

40 decelerated, and

In witness whereof,"I have hereunto set my hand this 30th day of June, 1925.

. JOHN D, HILLIARD. 

